Incandescent-electric-lamp socke.



J. s. GRossLBY. INCANDBSGENT BLBG'IRIG LAMP SOGKET.

' APPLIOATION FILED ooT.e,191o.

Patented June 20, 1911.

WIT/1161951? n JAMES S. CROSSLEY, OF SOLVAY, NEW YORK, ASSIGNOR T0 PASS SOLVAY, NEW YORK,

A CORPORATION.

INCANIDIESCENT-ELEC:[RIC-LAIVU? SOCKE` Specification of Letters Patent.

Patented J une 2U, 1911.

Application filed October 6, 1910. Serial No. 585,555.

To all whom itmay concern:

Be it knowinthat I, .nains S. CnossLnr, a citizen of the United States, residing at Solvay, in the county of Onondaga and State of New York, have invented new and useful Improvements in Incandescent-Eleen 'tric-Lamp Sockets, of which 'the following is a specitication-` My invention relates to the well known porcelain socket of Patent No. 568,919 to Pass and Seymour-and consists in certain improvements, particularly" in the switcln mechanism, wherebya double break is pro- Yduced in one leg of the circuit, when the" current is turned oli', and the danger' of accidental contacts and short'circuits reduced.

My invention` is shown Ain the drawing herewith in which the reference numerals of the description are used to indicate the cor-u responding parts in all the iigures. j

` Figure 1 is a vertical section taken on line 1 of Fig. 3 'of the assembled socket. Fig. 2 is a bottom pla-n of the cap. Fig. 3 is a top plan of the body. Fig. 4 is a vertical section taken on section line 4 of Fig.v 3 looking toward the left, for the purpose of showing the arrangement and operation of theparticular parts in question when the circuit is open. Fig. 5 is similar to Fig..4 showing the circuit closed. Fig. G is a vertical cross section of the complete socket taken at a right angle to Fig. l.

1 -indicates the cap` of the socket provided with' the upper extension 2, in which is formed lthe tubular recess 3 to receiveand retain in position the conductor cords 4. The

4`ends of the cords extend through the two insulated' and cut off from adjacent metallic parts by means of the straight wall 13 havterminal is provided with an upturned tip 15 to restrain the loose'conductor strands. The terminal 6 is arranged on a shoulder l1'? substantially parlalleland adjacent to terminal 5, but on the -opposite side of the wal1,gand has its contact screw carrying end benteups abojve the level of the terminal 5 into rather a deep channel 18, so as to be near the hole through which its conductor enters and to increase the separation between themetallic parts. 2l is a wider guide spur vintegral with the circumferential margin 22 of the cap and adapted to engage with a notch of Isimilar width formed in the body; 23 is a narrow guide Spur also on the fit the notch 24 formed in the body margin for the shaft of the key..

The upper face of the b'ody is adapted to tit the lower face of the cap and is provided with the central tubular projection 27. for the main contact screw 28 which engages with the screw; hole in the wireterminal 5, thereby mechanically securing the bod to the .base leg of the circuit. rlhe head 29 of this screw acts as the center lamp terminal. Said tubular projection is connected to the margin by the wall 32, whereby the partsare strengthened. Between said wall and an abutment 33 on the margin'is the notch for receiving the wide guide spar on the cap, whereby the relation of the c: p to the body is Xed. l

& SEYMOUR, INC., or

marginal wall adapted tov and also forming a portion of onebody, for the lamp terminals here shown of the Edison type. The outer terminal, or threaded copper shell 41 is secured in position by screws 42 and nuts 43 set in recesses 44 in the upper face of the upper wall 45 of the body, and desir-ably covered by insulating cement to avoid all danger of accidental contact. One of these screws also maintains` in position the resilient copper tongue, or extension, 47, which extends upwardly from the thlcaded shell into the opening 4S'in the4 transverse wall of the body and is thuselectrically a part of said shell and adapted to be engaged with a good wiping contact by the metallic cam 50 ot' the key shaft 51 when the latter is turned to close the circuit by means of the insulating thumb piece 52 on the outer end of the keyshaft extending through the notch 24.

On the upper face of the body is secured the key retaining plate 55 and the main con tact spring 56, by means of the nut 57 and of the single screw 58,'.which may be operated *through the socket mouth, where. its head rests in the depression 59 on the lower face of the transverse wall so as to bc fully insulated from the `shell flange.

f shaft is free to make engagement with the contact spring 56 through the hole in said plate. one and the same time said contact spring is pushed upwardly into engagement with the wire terminal 6 and the cam, as best shown in Figs. 1 and 5, makes contact with the tongue 47 bridging the gap between said spring and tongue and closing the circuit. But when the thumb piece is turned inthe position shown in Fig. 4, there is a double spring break, respectively between the spring and the wire terminal on the one hand, and the cam and tongue on 'the other. The cam is held in this position by the engagement of the contact spring, so that a double break in that leg of the circuit is maintained and insured.`

Having described my invention, I claim,

l. In an incandescent electric lamp key socket the combination with the cap and the body having a transverse wall near its upper end, said wall being formed with an opening, of wire terminals, on the cap, lamp terminals on the body, a metallic part connected to one lamp terminal and extending into said opening, means to securethe body to the cap, a suitably insulated contact spring arranged between the cap and the body, said spring'being initially out of contact with any metallic part except a cam, a shaft journaled between the cap and the body, and the metallic cam on the shaft, said cam being arranged between the metallic part. and thev contact spring and being adapted, when turned into longitudinal, circuit-closing position. to engage with bo'th said metallic Part and said spring, bridging the gap between them, and simultaneously to force the spring against one wire terminal. closing saidsecond gap.

2. In an incandescent electric lamp keysocket having two main parts, the cap and the body, the combination therewith of wire terminals on the cap,vlamp terminals on the body, a permanent connection between one lamp terminal `and the corresponding wire terminal, means to connect the cap and the body, a metal extension connected to the seco d terminal on one of said two parts, an ii sulated spring suitably supported and extending adjacent to the second terminal On turning the shaft and cam, at-

on the other of said two parts, a shaft journaled between the cap and the body, and a metallic cam on the shaft, said cam being adapted when turned in longitudinal current closing position, to engage with both the metal extension and Vthe spring, closing the gap between them,"`and simultaneously forcing the sprinoV into engagement with its adjacent'terminaI, closing said second gap.

3. In an incandescent electric lamp keysocket, having two main `porcelain parts, the cap and the body, said body having a transverse wall nearnits upper end, an opening therethrough and a mouth or recess in its lower portion for the lamp terminals, the combination with said two parts of wire terminals secured on the lower surface of the body and arraugedsubstantially parallel, a screw extending from said mouth through the transverse wall and engaging with the center wire terminal, a threaded shell secured in said mouth, a tongue connected to said shell and extending upwardly into the transverse wall opening, an insulated con tact spring secured on the upper surface of the transverse wall and extending over said opening, a shaft journaled between the cap and the body, a thumb-piece on the outer end of said shaft, and a metallic cam on the shaft, said cani being adapted, when turned in one direction, to close the circuit in its leg of the circuit by making contactwith the tongue simultaneously and by forcing the spring against the outer wire terminal, and when turned in the other direct-ion, to be out of contact with the tongue and to permit the spring' to retract.

4. A porcelain cap for incandescent elec tric lamp sockets, having two holes for the conductors, a tubular extension upwardly extending from the upper ends of said holes, and, on lts lower surface, an elevated bed, an adjacent shoulder, a straight separating wall between said bed and shoulder, said wall having a curved end extending around the end of the bed and, in combination with the cap, metallic wire terminals secured respectively on the bed and the shoulder, on opposite sides of the wall, said terminals being arranged substantiallyl parallel, and having their opposite ends provided with binding screws arranged adjacent to the inlet holes, and the terminal on the shoulder being upwardly bent. l

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

JAMES S. CROSSLEY. 

